/*
 * Copyright (c) 2003-2013, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.cm;

import java.io.File;

import org.knopflerfish.service.log.LogRef;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ConfigurationAdmin;

/**
 * CM bundle activator implementation
 * 
 * @author Per Gustafson
 */

public class Activator implements BundleActivator {
  private static final String STORE_DIR_PROP = "com.gatespace.bundle.cm.store";

  private static final String DEFAULT_STORE_DIR = "cm_store";

  static BundleContext bc;

  static LogRef log;

  static ConfigurationAdminFactory configAdminFactory = null;

  private ServiceRegistration<ConfigurationAdmin> serviceRegistration;


  public void start(BundleContext bc) {
    Activator.bc = bc;
    createLogRef();
    createAndRegisterConfigurationAdminFactory();
  }

  public void stop(BundleContext bc) {
    unregisterConfigurationAdminFactory();
    closeLogRef();
  }

  private void createLogRef() {
    log = new LogRef(bc);
  }

  private void closeLogRef() {
    if (log != null) {
      log.close();
      log = null;
    }
  }

  @SuppressWarnings("unchecked")
  private void createAndRegisterConfigurationAdminFactory() {
    configAdminFactory = new ConfigurationAdminFactory(getStoreDir());
    serviceRegistration = (ServiceRegistration<ConfigurationAdmin>)
      bc.registerService(ConfigurationAdmin.class.getName(),
                         configAdminFactory, null);
  }

  private void unregisterConfigurationAdminFactory() {
    if (serviceRegistration != null) {
      serviceRegistration.unregister();
      serviceRegistration = null;
    }
    if (configAdminFactory != null) {
      configAdminFactory.stop();
    }
  }

  private File getStoreDir() {
    String storeDirName = bc.getProperty(STORE_DIR_PROP);
    File storeDir = null;
    if (storeDirName == null || "".equals(storeDirName)) {
      storeDir = bc.getDataFile(DEFAULT_STORE_DIR);
    } else {
      storeDir = new File(storeDirName);
    }
    return storeDir;
  }

}
